Basic College Mathematics (9th Edition)

by
Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.

Published by
Pearson

ISBN 10:
0321825535

ISBN 13:
978-0-32182-553-7

Chapter 1 - Whole Numbers - Review Exercises: 126

Answer

Estimate: 1100; Exact: 1019

Work Step by Step

To estimate the amount remaining in Rachel's bank account, we first round 520 to 500, 385 to 400, and 1924 to 2000. Then we subtract the rounded numbers for what she spent from her original bank balance:
2000 - 500 - 400 = 1100.
To find the exact amount remaining in her bank account, we subtract what she actually spent from her original bank balance:
1924 - 520 - 385 = 1019.